Effects of temperature on feeding and digestive processes in fish

Volkoff, Hélène; Rønnestad, Ivar

doi:10.1080/23328940.2020.1765950

Cited by 273 publications

(167 citation statements)

References 114 publications

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“…If increased expression of npya2 occurs in this area of the midbrain, it would be in line with findings in goldfish ( Narnaware and Peter, 2001 ) and Chinook and Coho salmon ( Silverstein et al, 1998 ) that the POA is key in orexin detection, thermoregulation and mating behavior. Since these are all tightly intertwined with energy homeostasis and appetite ( Peyon et al, 1999 ; Volkoff and Rønnestad, 2020 ), a link between feeding status and npy expression level in this region would be unsurprising. While these are alluring speculations, tailored studies will be required to assess the plausibility.…”

Section: Discussionmentioning

confidence: 99%

Regional Expression of npy mRNA Paralogs in the Brain of Atlantic Salmon (Salmo salar, L.) and Response to Fasting

et al. 2021

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Neuropeptide Y (NPY) is known as a potent orexigenic signal in vertebrates, but its role in Atlantic salmon has not yet been fully established. In this study, we identified three npy paralogs, named npya1, npya2, and npyb, in the Atlantic salmon genome. In silico analysis revealed that these genes are well conserved across the vertebrate’s lineage and the mature peptide sequences shared at least 77% of identity with the human homolog. We analyzed mRNA expression of npy paralogs in eight brain regions of Atlantic salmon post-smolt, and the effect of 4 days of fasting on the npy expression level. Results show that npya1 was the most abundant paralog, and was predominantly expressed in the telencephalon, followed by the midbrain and olfactory bulb. npya2 mRNA was highly abundant in hypothalamus and midbrain, while npyb was found to be highest expressed in the telencephalon, with low mRNA expression levels detected in all the other brain regions. 4 days of fasting resulted in a significant (p < 0.05) decrease of npya1 mRNA expression in the olfactory bulb, increased npya2 mRNA expression in the midbrain and decreased npyb mRNA expression in the pituitary. In the hypothalamus, the vertebrate appetite center, expression of the npy paralogs was not significantly affected by feeding status. However, we observed a trend of increased npya2 mRNA expression (p = 0.099) following 4 days of fasting. Altogether, our findings provide a solid basis for further research on appetite and energy metabolism in Atlantic salmon.

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Section: Discussionmentioning

confidence: 99%

Regional Expression of npy mRNA Paralogs in the Brain of Atlantic Salmon (Salmo salar, L.) and Response to Fasting

et al. 2021

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“…The physiological responses of fish to low-temperature exposure have been extensively studied [ 6 ], and there is increasing interest in elucidating the mechanisms of fish adaptation to low-temperature environments and tolerance to low-temperature stress at the molecular level [ 7 ]. The decreasing costs of high-throughput sequencing and the application of bioinformatics technology have allowed researchers to use omics methods to analyse the molecular mechanisms and signalling pathways of fish responding to low-temperature stress at the overall biological level and explore the functional genes involved in low-temperature tolerance [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Chromosome-level genome assemblies ofChanna argusandChanna maculataand comparative analysis of their temperature adaptability

Huang

Cheng

et al. 2021

GigaScience

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Background Channa argus and Channa maculata are the main cultured species of the snakehead fish family, Channidae. The relationship between them is close enough that they can mate; however, their temperature adaptability is quite different. Results In this study, we sequenced and assembled the whole genomes of C. argus and C. maculata and obtained chromosome-level genome assemblies of 630.39 and 618.82 Mb, respectively. Contig N50 was 13.20 and 21.73 Mb, and scaffold N50 was 27.66 and 28.37 Mb, with 28,054 and 24,115 coding genes annotated for C. argus and C. maculata, respectively. Our analyses showed that C. argus and C. maculata have 24 and 21 chromosomes, respectively. Three pairs of chromosomes in C. argus correspond to 3 chromosomes in C. maculata, suggesting that 3 chromosomal fusion events occurred in C. maculata. Comparative analysis of their gene families showed that some immune-related genes were unique or expandable to C. maculata, such as genes related to herpes simplex infection. Analysis of the transcriptome differences related to temperature adaptation revealed that the brain and liver of C. argus rapidly produced more differentially expressed genes than C. maculata. Genes in the FoxO signalling pathway were significantly enriched in C. argus during the cooling process (P < 0.05), and the expression of 3 transcription factor genes in this pathway was significantly different between C. argus and C. maculata (P < 0.01). Conclusions C. maculata may have higher resistance to certain diseases, whereas C. argus has a faster and stronger response to low-temperature stress and thus has better adaptability to a low-temperature environment. This study provides a high-quality genome research platform for follow-up studies of Channidae and provides important clues regarding differences in the low-temperature adaptations of fish.

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“…One study has shown that digestive enzyme activity was significantly affected by abnormal temperature ( Pimentel et al 2015 ). The effect of water temperature on digestive enzymes in fish depends on species, because the optimal temperature of enzyme activity is usually in the temperature range corresponding to fish habitat ( Volkoff and Rønnestad 2020 ). Muscle is greatly affected by heat stress because in most species, this tissue constitutes approximately 50% of the body mass.…”

Section: Discussionmentioning

confidence: 99%

Draft genome of the Korean smelt Hypomesus nipponensis and its transcriptomic responses to heat stress in the liver and muscle

Xuan

Park

Choi

et al. 2021

G3 Genes|Genomes|Genetics

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Pond smelt (Hypomesus nipponensis) is a cold-freshwater fish species as a winter economic resource of aquaculture in South Korea. Due to its high susceptibility to abnormal water temperature from global warming, a large number of smelt die in hot summer. Here, we present the first draft genome of H. nipponensis and transcriptomic changes in molecular mechanisms or intracellular responses under heat stress. We combined Illumina and PacBio sequencing technologies to generate the draft genome of H. nipponensis. Based on the reference genome, we conducted transcriptome analysis of liver and muscle tissues under normal (NT, 5 °C) versus warm (HT, 23 °C) conditions, to identify heat stress-induced genes and gene categories. We observed a total of 1,987 contigs, with N50 of 0.46 Mbp with a largest contig (3.03 Mbp) in the assembled genome. A total number of 20,644 protein coding genes were predicted, and 19,224 genes were functionally annotated: 15,955 genes for Gene Ontology (GO) terms; and 11,560 genes for KEGG Orthology (KO). We conducted the lost and gained genes analysis compared with three species that human, zebrafish and salmon. In the lost genes analysis, we detected smelt lost 4,461 (22.16%), 2,825 (10.62%), and 1,499 (3.09%) genes compare with above three species, respectively. In the gained genes analysis, we observed smelt gain 1,133 (5.49%), 1,670 (8.09%), and 229 (1.11%) genes compare with above species, respectively. From transcriptome analysis, a total of 297 and 331 differentially expressed genes (DEGs) with False discovery rate (FDR) < 0.05 were identified in the liver and muscle tissues, respectively. Gene enrichment analysis of DEGs indicates that up-regulated genes were significantly enriched for lipid biosynthetic process (GO : 0008610, P < 0.001) and regulation of apoptotic process (GO : 0042981, P < 0.01), and down-regulated genes by immune responses such as myeloid cell differentiation (GO : 0030099, P < 0.001) in the liver under heat stress. In muscle tissue, up-regulated genes were enriched for hypoxia (GO : 0001666, P < 0.05), transcription regulator activity (GO : 0140110, P < 0.001) and calcium-release channel activity (GO : 0015278, P < 0.01), and down-regulated genes for nicotinamide nucleotide biosynthetic process (GO : 0019359, P < 0.01). The results of KEGG pathway analysis were similar to that of gene enrichment analysis. The draft genome and transcriptomic of H. nipponensis will be used as a useful genetic resource for functional and evolutionary studies. Our findings will improve understanding of the molecular mechanisms and heat responses and will be useful for predicting survival of the smelt and its closely related species under global warming.

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Effects of temperature on feeding and digestive processes in fish

Cited by 273 publications

References 114 publications

Regional Expression of npy mRNA Paralogs in the Brain of Atlantic Salmon (Salmo salar, L.) and Response to Fasting

Regional Expression of npy mRNA Paralogs in the Brain of Atlantic Salmon (Salmo salar, L.) and Response to Fasting

Chromosome-level genome assemblies ofChanna argusandChanna maculataand comparative analysis of their temperature adaptability

Draft genome of the Korean smelt Hypomesus nipponensis and its transcriptomic responses to heat stress in the liver and muscle

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